After further research, you have it right. No older than 1984. Also, the gas mileage rating of the new car is restricted too. In order to get the 3,500 voucher, there must be a 4 MPG improvement in the new car, and to get the 4,500 rebate, the new car must be a 10 mgp improvement. So, classic owners. We are out of the woods, and that none of our precious classics will get crushed because of this program.